Composite sheet



E. E. NGVOTNY.

COMPOSITE SHEET.

APPLICATION FILED MAY 20, ISIS.

1,377,502. Patented May 10,1921,l

,AL PLA-5775 MATER/AL FIBRE UNITED STATES PATENT OFFICE.

EMIL E. NOVOTNY, OF RIVERSIDE, ILLINOIS, ASSIGNOR T J. STOGDELL S'IOKES, 0F MOORESTOWN, NEW JERSEY.

' COMPOSITE SHEET.

Application led Hay 20, 1816. Serial No. 98,909.

To aZZwzomz't may-concern.'

Be it known that I, EMIL E. Novo'rNY, a citizen of the UnitedStates, residin at Riverside, in the county of Cook and tate of Illinois, have invented certain new and Vuseful Improvements in Composite Sheets, or which the following is a specification.

The present invention relates to a composition sheet for makin matrices or molds, and has particular app ication to a sheet adapted :lor making a matrix or mold to be use in the manufacture of printing plates.

As is. `well lmown to those inthe printing art, printing plates are comparatively expensive because they require special appliences and the exercise of considerable slrill in their manufacture, and therefore, when a printer desires to have a body oirJ type or cut or relief plate reproduced as a printing plate it is necessar tor himto have this vvorlr done in an estab ishment usually malrinea a specialty. ot this particular line of Work.

In the present instance it is my purpose to provide a sheet which is particularly vvell adapted Ilor making printing plates and Twhich can be sold to the printer in quantity at a relatively low cost, so that by a simple method, such, for instance, as is described my cO-pending application Serial No. 98,910, tiled May 20, i916, he can make his ovvn mold in his ovvn establishment, and 'can then make his own printing plates :trom such mold.'

With the above recited objects and others of a similar nature in vvievv, the invention consists in the proved com osite sheet and in the method of making t e same set forth in and falling within the scope of the appended claims.

'n the accompanying drawings: Figure l isperspective View ot of my mold sheet.

one form Fig. 2 is a cross sectional vievv taken through the same.

In the practice ot the invention I select a thin sheet or layer of metal preferably V possessing a certain degree of pliability and capable oi being rendered plastic, but having comparativel little ductilitythe preierable metal employed being lead, although other metals, such as copper, may be used. @ne facey ot this lead sheet, that is, the tace which will constitute the back ot the mold sheet is preferably electro-plated 'withr copper. To this .back face of the lead sheet I apply, in any suitable manner, a selected cement-like substance, when the latter is in a plastic condition, this substance being such that lWhen in itshardened or non-plastic state it will not lose its form. There' are various kinds of cements and embossing compositions which I might employ to form this backing sheet or layer, which is shown at B, but I have found that a plastic phenolic condensation product which as is Well known is a synthetic resin or resinous compositioncapablec of being hardened to the infusible or non-plastic state and which will.

not leave this `form when itI sets is admirable tor this purpose. There are several kinds or varieties of these phenolic condensation products Well known in the art to which they relate, one oi which is known as balrelite and is Well adapted lor my purpose. This cement is applied in its plastic state to the back of the lead sheet A' to form a backing coating, layer` or sheet oi a suitable thiclxness, for `instance, about twenty one-thousandths of an inch. While this cement is still in a plastic or pliable state or condition I preferably place an outer baching sheet or layer thereon, shown at C and which backing sheet is prelerablA in the nature ot flexible2 brous materia such as paper-board. Tins backing sheet C is employed tor the sake of economy in the use oi" cement and also to facilitate the molding operation, for if desired, instead oi' employing this paper-board backing sheet C, `which is of substantially the same thickness as the layer or cement sheet B, I may increase the thickness of. the cement layer'or sheet B, and dispense with the paper-boardshect- C, so that my composite plate in such case would be composed of a metallic lacing sheet and a cementitious backing sheet. The purpose of employing the cementbaching sheet B is to provide a rieldable backing for the lead facing sheet vv ich baclning `will be malmg the mold or matrix an will also ielding and resilient under ressure in y provide a neutral point for the tlow of the lead material in bendin a matrix or mold made from the sheet, lor'- the purpose 'of forming a curved or bowed mold for the manufacture of curved or partly cylindrical printing plates. l

It is of course to be understood that the various sheets or layers going to maire up this composite plete may be of any desired Vthickness, end that es meny layers or sheets as may be deemed necessary in the use of e particular composite plate ma be employed. in order to increase the ed erence of the cementitious sheet to the lead sheet and to `thereby avoid the peeling of such cementitious sheet from the beck of the lead sheet coat the beck fece of the leed lsheetI by elec tropieiihg 'with copper, tin or the like, thereby insuring y coherence between the sheets, because of che feci; ithe; the film produced by `the eiecvropieting Wiii possess e certain degree of porosiy, and will therefore act es e binder to erich-oior hoid the cementiisious sheet 13o 4the leed sheeihI A Whiie ii have herein shown and described one peisicuier embodiment of my invention ii Wish ie to be understood that do not com= fine mysei'f to eii the precise deteiis of ooeV Lemeoe sieruction herein sei: orth by wey of iiiief iretion 'es modicetion and variation may be mede Without departing` from the spirit of the invention oi' excee ing `the scope of the appended cieims.

What if claim is:

1. A vcomposite sheet comprisinge me fseiiic facing sheet, and a oementitious backing sheefJ cepebie of assuming e herdset eind infusioie forni under heet and pressure, seid facing shee having its beck provided with e porous coming' to insure coherehceof @he two sheete 1 2., A compositie 'sheet comprising e meceihc facing sheet end e herd, cementieious y becking sheet, seid facie sheet having its beck previded WiLh en e ectro-piezed coetimg to iiisiirelcoheremce of the ew'o shees.

im es'imeiiy whereof i eix my si meure f s @MEL E. NVYLNY, 

